Polydactyly or polydactylism, also known as hyperdactyly, is a congenital physical anomaly in humans, dogs, and cats having supernumerary fingers or toes.
Mirror hand (ulnar dimelia) is an exceedingly rare congenital anomaly of the upper limb. Characteristically there is duplication of the ulna, an absent radius, and multiple fingers which are symmetrical around the mid line
